I was online late last night when my ISP was hit by it, and I was down for over 12, maybe 14 hours.
At first I got upset because I figured it was just my ISP (it's happened before) either having problems or performing unannounced maintenance.
I got up this morning and called them to make sure my end wasn't the problem (I could connect but couldn't load any pages, so I figured it was their end) and they had a recording announcing their problems . . . well then I turned on the news and saw it was worldwide.